Microstructural analysis of SYNROC waste forms from basaltic melts

Technical Report · Thu Jul 01 04:00:00 EDT 1982

OSTI ID:6726156

Kelsey, P V; Miley, D V

The fabrication of titanate/zirconate-based nuclear waste forms (SYNROC) generally requires careful blending of finely divided powders or calcines followed by an extremely sensitive hot pressing step. A simple process has been developed by which titanate/zirconate-based nuclear waste forms are synthesized from basaltic melts. The synthesized waste forms have been examined by x-ray diffraction (XRD), standard metallography, and scanning electron microscopy (SEM). The following phases were identified by SEM and XRD: pseudobrookite (Fe/sub 2/TiO/sub 5/), zirconolite (CaZrTi/sub 2/O/sub 7/), chevkinite ((Ca,Ce)/sub 4/(Fe,Mg)/sub 2/Ti/sub 3/Si/sub 4/O/sub 22/), and perovskite (CaTiO/sub 3/). Uranium, gadolinium, and cerium (fission products) ions were selectively partitioned into the crystalline zirconolite, chevkinite, and perovskite phases.

• Research Organization: EG and G Idaho, Inc., Idaho Falls (USA)
• DOE Contract Number: AC07-76ID01570
• OSTI ID: 6726156
• Report Number(s): EGG-M-07182; CONF-820724-6; ON: DE83000538
• Country of Publication: United States
• Language: English

Related Subjects

052000* -- Nuclear Fuels-- Waste Management
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
BASALT
COHERENT SCATTERING
CRYSTAL STRUCTURE
DIFFRACTION
ELECTRON MICROSCOPY
IGNEOUS ROCKS
MANAGEMENT
MATERIALS
METALLOGRAPHY
MICROSCOPY
MICROSTRUCTURE
OXYGEN COMPOUNDS
PROCESSING
RADIOACTIVE MATERIALS
RADIOACTIVE WASTE PROCESSING
RADIOACTIVE WASTES
ROCKS
SCANNING ELECTRON MICROSCOPY
SCATTERING
SOLID WASTES
SYNROC PROCESS
TITANATES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
VOLCANIC ROCKS
WASTE MANAGEMENT
WASTE PROCESSING
WASTES
X-RAY DIFFRACTION
ZIRCONATES
ZIRCONIUM COMPOUNDS